Adult osanyin crystalwings can grow to great sizes, though the biggest are usually guardians of forests. Although their purpose is to protect, they understand that gardens need to be harvested, and forests can be logged - though under the watchful eye of the osanyin guardians, magi are very careful to take only trees that are dead, dying, or a danger to the rest of the forest. Osanyin adults spend most of their time nurturing their territory and raising their hatchlings, but when threatened they can turn the land itself against an intruder.

Osanyin crystalwings are gentle creatures despite their formidable size and appearance - until their gardens and forests are threatened. Found mostly in temperate and northern biomes, where they can blend in better, osanyin are guardians of nature. Each osanyin family chooses a forest or a garden to guard as their own, where they raise their hatchlings and defend against any intruders that seek to harm their trees and plants. An osanyin-protected spot of nature will always grow well, which has led magi to befriend these crystalwings and encourage them to choose Keep and city gardens, as well as nearby farmlands and rural areas. In return for their protection, magi provide osanyin crystalwings with offerings taken from their harvests, whether grains, fruit, or a portion of carefully logged trees.